Cutter head for dry shaving apparatus

ABSTRACT

In a cutter head for a dry shaver, a foil constituting an upper cutter is bent downwards at a margin to constitute an upper comb, a lower cutter and a lower comb constitute a unit which is reciprocated and urged upwards, but the lower comb is nevertheless a resilient part independent of the lower cutter.

United States Patent 1151 3,704,518 A Heyek Y 1 Dec. 5, 1972 [s41 CUTTERHEAD FOR DRY SHAVING 2,975,516 3/1961 Heyek ..30/34.1

APPARATUS [72] Inventor: Gerhard l-leyek, Rosenberggasse 61,

8010 Graz Austria Attorney-Watson, Cole, Grindle & Watson [22] Filed:Sept. 8, 1970 57 ABSTRACT 21 Appl. 110.: 70,084 1 In a cutter head for adry shaver, a foil constituting an upper cutter is bent downwards at amargin to con- U.S. "SO/346.51, titute an upper comb a lower cutter anda lower [51] Int. Cl ..B26b 19/04, B26b 19/10 o b onstitute a unit whichis reciprocated and [58] Field of Search ..30/34.l, 346.51 nrgedupwards, but the lower comb is nevertheless a resilient part independentof the lower cutter. 56 References Cited l 1 3 Claims, 2 Drawing FiguresUNITED STATES PATENTS 3,550,281 12/1970 Loner ..30/34.l

I n Q 3b 5a 5a 1 3b 3 c .1 H 3c PAIENTEDBEB 51912 3.704.518

INVENTOR 66 Fla PCL Maya? amwv [um 1 CUTTER HEAD FOR DRY SHAVINGAPPARATUS British patent specification No. 1,184,114 describes a cutterhead for dry shaving apparatus, which includes an upper cutter and alower cutter each formed of curved and yielding cutter foils. Thecurvature of the lower cutter foil is brought about by opposed forces,

which are exerted on the foil by a tension member en- I gaging opposededge parts of the foil, and the entire lower cutter is pressedelastically against the upper cutter and is movable relatively to thelatter in the cutting direction. According to the teaching of the abovementioned patent specification, the upper cutter foil is bent at itsmargins towards the concave side of its curvature, i.e., downwards, withthe formation of edges, and the curved lower cutter foil in theimmediate neighborhood of the bent edges of the upper cutter foil eitherterminates or is bent, while at least one bent edge of the upper cutterfoil, and in the zone of the lower cutter foil which is adjacentto thisbent edge, comb cutting parts are formed.

The present invention relates to a further development of this cutterhead construction, which aims to ensure satisfactory cooperation of theupper cutter and lower cutter of the perforated cutting part on the onehand, and of both combs of each comb cutter part on the other hand,without the need for a specially high precision in the manufacture ofthe individual parts of the cutter head. I,

This is achieved according to the invention, in that the comb of thelower cutter unit, that cooperates with the comb on the upper foil, isnot as in the cutter construction described in the above mentionedpatent specification directly formed in a zone of the lower foiladjacent to a bent edge of the upper foil, but is formed on a resilientpart independent of the lower foil for the perforated part.

Preferably the comb of the lower cutter unit is releasably mounted on atension member for the lower foil.

When comb parts are formed on both sides of the perforated part, as isthe case in a preferred constructional form of the invention, then thelower combs of the two comb parts are preferably formed on oppositemarginal zones of a common metal foil; this metal foil may then befastened to the tension member for the lower foil of the perforatedpart.

Further features of the invention appear from the following descriptionof a constructional example, which is shown in the accompanyingdrawings. In these drawings FIG. 1 shows a cutter head schematically incross section; and

FIG. 2 shows in perspective a portion of the marginal area of the cutterhead, from which the cooperation of the three foils used in the cutterhead can be seen.

A cutter head frame 1 is removably fixed to the upper part of thehousing of the dry shaving apparatus.

In the interior of the cutter head frame 1 there is arranged a lowercutter unit, which, by means of known driving elements (not shown), isdisplaced in a reciprocatory motion in the direction perpendicular tothe plane of the drawing, and by springs (not shown) is pressedresiliently into the concavity of the upper foil 3.

The lower cutter unit has a frame 4, which, on its upper side, carriesengaging pins 4afor two parts of the unit. The lower cutter 5 of theperforated part is a curved metal foil, the side margins 5a of which arebent inwards and engaged on the pins 4a by means of holes. By thisengagement of the side margins ofthe foil 5a, this foil is compelledinto the desired curvature. The frame 4 thus acts as a tension member.The height of the curvature above a chord is advantageously at mostequal to half the radius of curvature of the cutter foil at the apex ofits curvature.

The lower combs 6a of two comb parts are each in the form of a row ofslits on the bent side margins of a metal foil 6, which likewise engageson the pins 4a by means of holes.

It can be seen without more explanation, that in this construction theperforated or slit area of the lower foil 5, which cooperates with theperforated area 3a of the upper foil 3, and the two combs 6a, whichcooperate with the combs 3b on the bent edges or bend lines 30 of theupper foil 3, are resilient independently of one another, and engage theupper foil 3 under this resilient action, so that for all parts of thecutter head a satisfactory cuttingpressure is ensured.

Various modifications are possible within the scope of the invention. Inparticular it is possible to provide a comb part only on one side of thecutter head, while on the opposite side the corresponding part of thefoil 6 is formed simply as a sliding guide.

I claim:

1. A cutter head for dry shaving apparatus comprising a perforated partincluding an upper cutter and a lower cutter, a comb part including anupper comb and a lower comb, said upper cutter comprising a yieldablefoil which is completely curved convexly, said foil having marginaledges bent downwardly along a pair of spaced bend lines, said upper combbeing formed along one of said bend lines, a head frame, said marginaledges being connected to said head frame beyond said upper comb, saidlower cutter comprising a curved and yieldable foil having inwardly bentmargins, a cutter frame, said inwardly bent margins being connected tosaid cutter frame, and said lower comb comprising a separate yieldablefoil also connected to said cutter frame, so that said lower cutter andsaid lower comb constitute a unit which may be reciprocated relative tosaid upper cutter.

2. A cutter head as claimed in claim 1, including pins on said cutterframe extending between said lower' cutter and said inwardly bentmargins to fix thereby the curvature of said lower cutter, said lowercomb being releasably mounted on said cutter frame by means of saidpins.

3. A cutter head as claimed in claim 1, including another upper combbeing formed along the other one of said bend lines, said upper cutterfoil having cutting perforations therein located between said uppercombs, said lower comb foil having opposing marginal zones, and saidlower comb being defined by a row of slits located at said marginalzones.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 704,518 Dated December 5, 1972 Inventor(s) GERI-IARD HEYEK It is certified.that error appears in the above-identified patent and that said LettersPatent are hereby corrected as shown below':

On the title page, please insert Claims priority on Austrian ApplicationNo. A86l2/69, filed September 10,

Signed and sealed this 22nd day of May 1973.

(SEAL) Attest:

EDWARD M.FLETCHER,JR. ROBERT GOTTSCHALK Attesting Officer Commissionerof Patents F ORM PO-105O (10-69) USCOMM-DC 60376-P59 I w I.I.S.GOVERNMENT PRINTING OFFICE: 1969 O366-334.

1. A cutter head for dry shaving apparatus comprising a perforated partincluding an upper cutter and a lower cutter, a comb part including anupper comb and a lower comb, said upper cutter comprising a yieldablefoil which is completely curved convexly, said foil having marginaledges bent downwardly along a pair of spaced bend lines, said upper combbeing formed along one of said bend lines, a head frame, said marginaledges being connected to said head frame beyond said upper comb, saidlower cutter comprising a curved and yieldable foil having inwardly bentmargins, a cutter frame, said inwardly bent margins being connected tosaid cutter frame, and said lower comb comprising a separate yieldablefoil also connected to said cutter frame, so that said lower cutter andsaid lower comb constitute a unit which may be reciprocated relative tosaid upper cutter.
 2. A cutter head as claimed in claim 1, includingpins on said cutter frame extending between said lower cutter and saidinwardly bent margins to fix thereby the curvature of said lower cutter,said lower comb being releasably mounted on said cutter frame by meansof said pins.
 3. A cutter head as claimed in claim 1, including anotherupper comb being formed along the other one of said bend lines, saidupper cutter foil having cutting perforations therein located betweensaid upper combs, said lower comb foil having opposing marginal zones,and said lower comb being defined by a row of slits located at saidmarginal zones.